The number of worms that do not require an intermediate host to complete the life cycle is 100

Trichinella. Trichinella larvae parasitize muscle fibers.

Inside, it generally forms a sac, which is lemon-shaped and contains a slightly curved spiral-like larva. The capsule consists of two layers of connective tissue.

Constitute. The outer layer is very thin and has a large amount of connective tissue; The inner layer is clear glass-like, cell-free.

The phylum Aschelminthes is a parasitic worm of the Nematoda class (Nematoda), the scientific name is Trichinella spiralis. Worldwide distribution. Long metric (inch). Causes humans and other mammals.

pigs, dogs, cats, bears, foxes, rats) - trichinosis. Mating in the host's small intestine, the female burrows into the intestinal wall to produce larvae, which are carried to all parts of the body by the bloodstream. It grows in muscle, matures in about 16 days, and forms around the larvae.

After the cyst-containing muscles are swallowed by a suitable host, the larvae develop further, mature in the host's intestine, and reproduce. Adult Trichinella parasitizes the small intestine and is called Trichinella inguta; The larvae live on the striated muscles.

Inside, it is called Trichinella myogenesis.

Hookworm is selected, filamentous larvae directly invade the human body** or migrate in the human body to cause damage to the human body.

C, Clonorchis sinensis should be chosen.

Answer] Pai Zao Sui: c

The first intermediate host of flukes is freshwater snails or molluscs, the second intermediate host can be fish, crustaceans or arthropods depending on the species, and most of the terminal rocks are vertebrates and humans.

Answer]: Pretend to be a paulownia

After Schizocephalopephalia mansoni infects humans, it can be infected with lead in both lead and insidious taeniasis.

The life of roundworms does not need to be judged by the middle ridge, and it is a direct poor sale development type ().

a.That's right. b.Mistake.

Correct Answer: a

The most important life cycle of biomass helminths is characterized by the fact that the larvae need to develop into an infectious stage in an intermediate host before they can infect humans.

Biogenic helminths, a biological term, refers to a class of worms that need to develop into an intermediate host or blood-sucking insect in their life history before they can infect a human. Mainly include: fasciola ginger, clonorchis sinensis, tapeworm solium, etc.

Prevention and control principles: harmless treatment of feces, strengthening health publicity, paying attention to personal hygiene and eating habits, not eating raw meat, eliminating intermediate hosts, etc.

"Parasites" to grasp the point1. Host oak classification: terminal host, intermediate host, storage or insect protection host, and successor host.

2. Parasites on the host: nutrient seizure, mechanical damage, chemical toxicity, allergen effects.

3. Characteristics of parasite epidemics: endemic, seasonal, and natural epidemic origins.

4. Soil-transmitted worms do not use intermediate hosts, while biotic parasites do.

5. Ascaris infection period is 2 to 3 months, and there are more adult worms in the small intestine and jejunum.

6. Whipworms live in the intestines for about a month, and humans are the only source of infection.

7. Pinworms are parasitic in the ileum.

8. The filamentous larvae of hookworm are infected, and the adult worms can cause large fecal toxin, xanthoma, and mulberry leaf yellow in the small intestine. Pica is commonly used in patients with hookworm disease.

9. The filariform larvae of filarial worms parasitize in large lymphatic vessels or lymph nodes, which can cause fire, elephantiasis and chyluria.

10. Flukes, except for schistosomiasis, are all hermaphrodites.

A should be chosen

The final and intermediate hosts of Trichinella can be the same parasite, and after the female produces larvae in the intestines, the larvae travel with the blood throughout the body, and the larvae that flow to the striated muscles can continue to develop.

Humans cannot be intermediate hosts for Taenia solium.

Answer]: A biotic worm must undergo the development of the middle host in the middle host during its development, so it needs to change hosts.

Correct answer: d

Analysis: Ascaris.

Whipworms and pinworms.

All of them are infected by accidentally ingesting infected eggs.

Ascaris infected eggs hatch larvae in the small intestine, burrow into submucosal blood vessels, enter the bloodstream, reach the lungs through the right heart, penetrate the alveolar capillaries into the alveoli, and follow the bronchi.

The trachea retrograde to the pharynx, enters the digestive tract with the swallowing action of the person, and develops into adult worms, while whipworms and pinworms develop directly into adult worms in the intestine.

Although hookworms and roundworms have a similar development process in vivo, the infection route is mainly through **infection.

Trichinella is infected by ingestion of meat containing live larval cysts, which develop into adult worms in the intestinal lumen.

Females and males mate, and females produce new larvae in the intestinal mucosa, and the larvae reach all parts of the body with lymphatic and blood circulation, in the striated muscles.

Larval cysts are formed within the body, and can continue to develop into adults when they have a chance to enter another host.